This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
| n | a(n) |
|---|---|
| 1 | 24 |
| 2 | 672 |
| 3 | 14976 |
| 4 | 311808 |
| 5 | 6334464 |
| 6 | 127475712 |
| 7 | 2555805696 |
| 8 | 51166445568 |
| 9 | 1023731564544 |
| 10 | 20477852516352 |
| 11 | 409582820130816 |
| 12 | 8191862561046528 |
| 13 | 163838900488372224 |
| 14 | 3276791203906977792 |
| 15 | 65535929631255822336 |
| 16 | 1310719437050046578688 |
| 17 | 26214395496400372629504 |
| 18 | 524287963971202981036032 |